Switch to OIDC authentication

web/errors.py

@@ -0,0 +1,17 @@
+import flask
+import werkzeug.exceptions
+
+def init_app(app):
+    @app.errorhandler(werkzeug.exceptions.HTTPException)
+    def http_error(e):
+        return e
+
+    @app.errorhandler(TimeoutError)
+    def timeout_error(e):
+        return flask.render_template('busy.html')
+
+    @app.errorhandler(Exception)
+    def internal_server_error(e):
+        return flask.Response(f'something went catastrophically wrong: {e}',
+                status=500, mimetype='text/plain')
+